A Body Disc Brake Swap 101

I just finished changing out my ball joints, upper bushings, rotors, pads, and tie rods on my car which was swapped at some point in its life. Wish I would had read this before I ordered parts! Luckily I was able to return most of them. Who knows what the rubber rings are that comes with the brake hardware kits? When I pulled my calipers off they didnt have these. Thanks!
The ones in this picture:
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